[PATCH] ntdll: Fix a memory leak (Valgrind).

[Marvin]

Hi,

While running your changed tests, I think I found new failures.
Being a bot and all I'm not very good at pattern recognition, so I might be
wrong, but could you please double-check?

Full results can be found at:
https://testbot.winehq.org/JobDetails.pl?Key=78452

Your paranoid android.


=== debiant (32 bit WoW report) ===

ntdll:
threadpool.c:1904: Test failed: WaitForSingleObject returned 258